Region
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Washington (State)
6
Amazon River Region
5
Antarctica
5
East Asia
5
Louisiana
5
Massachusetts
5
Nevada
5
Québec (Province)
5
South Africa
5
Sweden
5
Tanzania
5
Western Hemisphere
5
Africa, Southern
4
Arizona
4
Canada, Northern
4
Germany (West)
4
Hudson River Valley (N.Y. and N.J.)
4
Illinois
4
Los Angeles
4
New Jersey
4
Philippines
4
Spain
4
Tellico Dam (Tenn.)
4
Turkey
4
Zimbabwe
4
Africa, Sub-Saharan
3
Argentina
3
Baltic Sea
3
British Columbia
3
Chicago
3
Clayoquot Sound Region
3
Cuba
3
Developed countries
3
Ethiopia
3
European Economic Community countries
3
Former Soviet republics
3
Indiana
3
Malaysia
3
Mali
3
Mexico City
3
Middle East
3
Morocco
3
Nebraska
3
New Orleans
3
OECD countries
3
Oregon
3
Poland
3
Russia
3
Singapore
3
South Asia
3
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